NL284345A - - Google Patents

Info

Publication number
NL284345A
NL284345A NL284345DA NL284345A NL 284345 A NL284345 A NL 284345A NL 284345D A NL284345D A NL 284345DA NL 284345 A NL284345 A NL 284345A
Authority
NL
Netherlands
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of NL284345A publication Critical patent/NL284345A/xx

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
    • G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Liquid Crystal (AREA)
NL284345D 1961-10-16 NL284345A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CS611161 1961-10-16
CS306563 1963-05-28

Publications (1)

Publication Number Publication Date
NL284345A true NL284345A (en)

Family

ID=25745741

Family Applications (2)

Application Number Title Priority Date Filing Date
NL284345D NL284345A (en) 1961-10-16
NL6402500A NL6402500A (en) 1961-10-16 1964-03-11

Family Applications After (1)

Application Number Title Priority Date Filing Date
NL6402500A NL6402500A (en) 1961-10-16 1964-03-11

Country Status (4)

Country Link
US (1) US3227042A (en)
CH (2) CH395579A (en)
GB (2) GB984466A (en)
NL (2) NL6402500A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH427334A (en) * 1963-08-28 1966-12-31 Bertele Ludwig Lens changeable focal length
CH485242A (en) * 1968-07-12 1970-01-31 Meopta Narodni Podnik Projection lens with continuously variable focal length
US3597048A (en) * 1969-02-07 1971-08-03 Ludwig Bertele Varifocal objective with movable lens component of positive refractivity
AT287341B (en) * 1969-08-14 1971-01-25 Eumig Pancratic projection lens
JPS5852201B2 (en) * 1974-04-04 1983-11-21 ミノルタ株式会社 variable magnification lens
JPH0658454B2 (en) * 1985-07-03 1994-08-03 キヤノン株式会社 Variable magnification finder
JP2699394B2 (en) * 1988-04-07 1998-01-19 ミノルタ株式会社 Variable magnification finder optical system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US696788A (en) * 1901-02-25 1902-04-01 Clile C Allen Optical objective.
US2165341A (en) * 1936-07-28 1939-07-11 Eastman Kodak Co Photographic objective
US2784644A (en) * 1953-10-26 1957-03-12 Mcculloch Motors Corp Optical system attachment of variable focus for camera and projector objectives
US3023673A (en) * 1958-12-12 1962-03-06 Bell & Howell Co Variable magnification afocal lens member

Also Published As

Publication number Publication date
CH465261A (en) 1968-11-15
CH395579A (en) 1965-07-15
US3227042A (en) 1966-01-04
GB984466A (en) 1965-02-24
GB1023840A (en) 1966-03-23
NL6402500A (en) 1964-11-30

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